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Derivative Instruments - Statement Of Financial Position (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Sep. 30, 2021
--- | --- | ---
Derivative [Line Items] |  |
Derivative asset, net, gross fair value | $ (40,149) | $ (50,970)
Derivative assets, net, net fair value | (40,149) | (50,970)
Current derivative assets |  |
Derivative [Line Items] |  |
Derivative asset, gross fair value | 281 | 186
Derivative asset, amounts netted | (198) | (186)
Derivative assets, net fair value | 83 | 0
Non-current derivative assets |  |
Derivative [Line Items] |  |
Derivative asset, gross fair value | 267 | 228
Derivative asset, amounts netted | 0 | (122)
Derivative assets, net fair value | 267 | 106
Current derivative liabilities |  |
Derivative [Line Items] |  |
Derivative liability, gross fair value | (31,182) | (42,330)
Derivative liability, amounts netted | 198 | 186
Derivative liability, net fair value | (30,984) | (42,144)
Non-current derivative liabilities |  |
Derivative [Line Items] |  |
Derivative liability, gross fair value | (9,515) | (9,054)
Derivative liability, amounts netted | 0 | 122
Derivative liability, net fair value | $ (9,515) | $ (8,932)

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